Ten years after a global economic collapse, a cold-blooded drifter traverses the scorched Australian outback on a mission to track down the men who stole his last remaining possession - his car. When he crosses paths with a badly wounded member of the gang, he takes the vulnerable, naïve young man along as his unwitting accomplice.

The majority of the story is set in and around the Aokigahara Forest, a forest at the northwest base of Mount Fuji in Japan known as a popular destination for suicide. Sara Price (Natalie Dormer), an American woman, receives a phone call from the Japanese police telling her that they think her troubled twin sister Jess Price (also Dormer) is dead, as she was seen going into Aokigahara forest. Despite the concerns of her fiance, Rob, she journeys to Japan and arrives at the hotel where her sister was staying. At her hotel, Sara meets a reporter named Aiden. They drink together, and she tells him of her parents' death. In reality, her father killed her mother, then committed suicide, but she tells him they were killed by a drunk driver. Her sister saw the bodies, but she didn't look. Aiden invites her to go into the forest with him and a park guide, Michi, so she can look for her sister..

Steven is a troubled kid from Maine being sent to boarding school. While his father, Richard Portman, is driving him there, they get into a bad argument, and the car swerves into oncoming traffic, killing Richard and putting Steven in a vegetative state. Six months later, Steven's stepmother, Mary, is taking care of him. Mary is a psychologist who works from home with children and adolescents. She is upset to learn that one of her patients, a deaf child named Tom, is to be transferred to a school in Boston. Later, Mary discusses Steven with her therapist, Dr. Wilson. While she feels guilty, she has decided to put Steven in a home to be cared for because he is unresponsive.

Linguistics professor Louise Banks leads an elite team of investigators when gigantic spaceships touchdown in 12 locations around the world. As nations teeter on the verge of global war, Banks and her crew must race against time to find a way to communicate with the extraterrestrial visitors. Hoping to unravel the mystery, she takes a chance that could threaten her life and quite possibly all of mankind.